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The S-5420 comprises a high- and low-sensitivity photodiode. The S-5420 enables filter-less detection of UV components by calculating the difference between PD outputs to remove visible light components. (Graphic: Business Wire)

The S-5420 comprises a high- and low-sensitivity photodiode. The S-5420 enables filter-less detection of UV components by calculating the difference between PD outputs to remove visible light components. (Graphic: Business Wire)

The S-5420 detects UV light without a filter by calculating the
difference between high and low-sensitivity photodiode signals to remove
visible light. The filter-less structure enables compact applications
and prevents filter-induced attenuation. The compact transparent resin
package expands the design flexibility of wearable devices.

This product is co-developed by a research team led by professors
Shigetoshi Sugawa and Rihito Kuroda at the Graduate School of
Engineering, Tohoku University.

(*1) Based on our research as of June 2018.(*2) A UV light
photodiode manufactured from silicon: Silicon semiconductors are highly
versatile and silicon sensors readily lend themselves to the future
evolution of circuit integration and high performance.(*3) UV
light from the UV-A to the UV-B range: The wavelength of UV-A is 315 -
400 nm, and UV-B is 280 - 315 nm, respectively.

Thanks to the use of silicon semiconductors, the S-5420 can measure UV
light from the UV-A range, which causes skin blemishes and wrinkles, to
the UV-B range, which causes sunburn. The small size of the S-5420
transparent resin package makes it easy to fit it into a variety of
wearable devices allowing anyone to easily measure UV light intensity.Compact
size also promises high design flexibility of industrial devices like UV
irradiance and exposure meters.

Major Features1. Detects UV light from the UV-A to the UV-B
range.2. Eliminates the need for a filter by calculating
the difference between the two photodiodes.3. Compact resin
package